Comment 2 for bug 1258020

StacktraceTop:
 sigorset (dest=0xa6e, left=0xbd8, right=0x6) at sigorset.c:30
 __GI_qsort_r (b=0xa6e, n=3032, s=6, cmp=0xffffffffffffffff, arg=0x0) at msort.c:175
 malloc_printerr (ptr=0x7fceb4080c20, str=0x7fceeed294c4 "malloc(): memory corruption", action=393216) at malloc.c:4927
 _int_malloc (av=0x7fceb4082b90, bytes=<optimized out>) at malloc.c:3402
 TT_RunIns () from /home/darkxst/gnome3-amd64/usr/lib/x86_64-linux-gnu/libfreetype.so.6